B K/mueller Inds(import) 521-985HN Black Hex Bushing

Product Description

The B K/MUELLER INDS(IMPORT) 521-985HN is a black hex bushing used to reduce pipe thread sizes in plumbing and gas piping systems. This fitting accepts a larger female thread on one end and a smaller male thread on the other, allowing technicians to connect pipes or fittings of different nominal sizes within the same run. The black finish is standard for gas distribution applications. Each unit ships as part of a 5-pack, making it practical for service vehicles and job-site stock. Licensed plumbers and pipefitters are the primary installers of this type of fitting.

Black hex bushings in this size range are commonly used in residential and light commercial gas piping systems, as well as in some hydronic and industrial plumbing applications. The 2-inch female to 1-inch male configuration is a frequently encountered reduction in gas branch lines, manifold assemblies, and equipment connections where pipe sizes transition at valves, meters, or appliance inlets.

Key Features

• 2-inch female NPT to 1-inch male NPT reduction in a single fitting
• Black finish suits gas piping and iron pipe system applications
• Hex profile allows secure wrench engagement during installation
• Sold in a 5-pack quantity for job-site or service-truck stocking
• Compact hex bushing design reduces the need for additional coupling and nipple combinations

Compatibility

Designed as an OEM-style replacement or standard-stock fitting for black iron pipe systems using NPT threaded connections in residential and commercial gas or plumbing installations.

Installation Notes

Installation of black hex bushings in gas piping systems must be performed by a licensed plumber or gas fitter in accordance with the International Fuel Gas Code (IFGC) and applicable local codes. Shut off and verify zero pressure at the gas supply before threading any fitting. Apply appropriate thread sealant or listed pipe compound rated for gas service to the male threads before assembly. Do not use excessive force or extensions on the wrench, as overtightening can crack or distort the fitting.